Answer:
people face trade offs
Explanation:
Because wants are unlimited and the resources used to satisfy those wants are limited, people have to face trade offs. these trades off are opportunity costs.
Opportunity cost or implicit is the cost of the option forgone when one alternative is chosen over other alternatives.
In this question, the wants are a cell phone or an amplifier. the resource is $200. If the amplifier is bought, the cell phone cannot be purchased. This is an example of a trade off
